A Chaos Siege Giant’s armour can be fitted with scaling spikes, hooks and chains to aid the Chaos army’s assault against fortifications and these may prove useful even if the Giant perishes in the attack.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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If a Giant with this upgrade perishes and falls over an obstacle such as a moat, ditch or wall, mark the obstacle, which now may be crossed as open terrain. Additionally, if the Giant dies at the foot of a building or fortification, models assaulting any garrison across the location of its body gain a special +1 bonus to their Combat Resolution.